This is similar to Matthew, chapter 26:69, and Luke, chapter 22:56, but Peter was warming himself. John, chapter 18:16-17, has less about the servant-girl. Mark said that Peter was sitting outside in the high priest’s lower courtyard (Καὶ ὄντος τοῦ Πέτρου κάτω ἐν τῇ αὐλῇ). Then a young servant-girl or maid of the high priest came up to him (ἔρχεται μία τῶν παιδισκῶν τοῦ ἀρχιερέως). This does not sound good for Peter.